Lmfao. It's a square. With a picture on it. Not credit card details people are sharing..... Geez. People get some perspective. It's hardly life or death....
Surely if someone pays for something then they own that and are free to do what they want with it? Otherwise what exactly are u paying for? Is the theme still the property of the author?? I think not.
I paid for my house and car and clothes and all my DVDs and CDs that I posses. And if I want to show them, lend them or even give them to someone else then I am free to do so because I paid for them.
There is a difference between people "pirating" a theme and simply sharing some artwork which has reused for a different theme. At the end of the day ALL the artwork has came from somewhere originally (For example the original app authors icon) and I'm sure very few icons have been made 100% from scratch.